An aneurysm is a balloon-like bulge in an artery. Aneurysms can form in arteries of all sizes. An aneurysm occurs when the pressure of blood passing through part of a weakened artery forces the vessel to bulge outward, forming what you might think of as a blister. Not all aneurysms are life-threatening. But if the bulging stretches the artery too far, this vessel may burst, causing a person to bleed to death.

Where do aneurysms occur in the body?
In parts of the aorta. The aorta is the large vessel that carries blood from the heart to other parts of the body. Aortic aneurysms can occur in the area below the stomach (abdominal aneurysm) or in the chest (thoracic aneurysm). An abdominal aortic aneurysm (AAA) is usually located below the kidneys. Aortic dissection can occur in the aorta and its main branches.
How do aneurysms happen, and who is at risk?
Any condition that causes the walls of the arteries to weaken can lead to an aneurysm. The following increase the risk of an aneurysm or an aortic dissection:
Atherosclerosis (a build-up of fatty plaque in the arteries).
High blood pressure.
Smoking.
Deep wounds, injuries, or infections of the blood vessels
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